EP0408083B1 - Pompe de dosage à membrane pour liquides agressifs - Google Patents

Pompe de dosage à membrane pour liquides agressifs Download PDF

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Publication number
EP0408083B1
EP0408083B1 EP19900113590 EP90113590A EP0408083B1 EP 0408083 B1 EP0408083 B1 EP 0408083B1 EP 19900113590 EP19900113590 EP 19900113590 EP 90113590 A EP90113590 A EP 90113590A EP 0408083 B1 EP0408083 B1 EP 0408083B1
Authority
EP
European Patent Office
Prior art keywords
valve elements
liquid
pump
boring
membrane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19900113590
Other languages
German (de)
English (en)
Other versions
EP0408083A1 (fr
Inventor
Dragutin Vukicevic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0408083A1 publication Critical patent/EP0408083A1/fr
Application granted granted Critical
Publication of EP0408083B1 publication Critical patent/EP0408083B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers
    • F04B9/131—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members
    • F04B9/135—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by two single-acting elastic-fluid motors, each acting in one direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
    • F01L25/063—Arrangements with main and auxiliary valves, at least one of them being fluid-driven the auxiliary valve being actuated by the working motor-piston or piston-rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/10—Pumps having fluid drive
    • F04B43/113—Pumps having fluid drive the actuating fluid being controlled by at least one valve
    • F04B43/1136—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel

Definitions

  • This invention relates to an aggressive liquid pump for transferring and dosing.
  • membrane pumps for pumping aggressive liquids.
  • One type is a membrane piston pump powered by an electric motor.
  • Such pumps comprise a single leaf membrane, which is directly connected via a connecting rod with the electric motor.
  • the pump may or may not be provided with a speed reducing means.
  • the frequency of the pumps without the reducing means is equal to the number of cycles of the electric motor, and the aggressive liquids flow rate is controlled by a degree to which an eccenter moves the connecting rod and therefore the membrane.
  • the frequency of the pump provided with the speed reducing means is less than the number of cycles of the electric motor. Therefore the pump speed reduction results in easier flow rate control.
  • the use of reducing means is on the other hand disadvantageous because those pumps are considerably larger than the pumps without it. This is due to the fact, that the design and production of the pumps provided with the reducing means are much more complex. Both designs are presently considered to be obsolete.
  • Another type is a pneumatic operated membrane pump as for example disclosed in the EP0 315 264.
  • the pump of the European patent application is constructed for transferring beer or carbonated beverages and not for aggressive liquids, but it is a good example to demonstrate the basic principles of this kind of pumps.
  • These pumps comprise usually two membranes opposite one to another.
  • the pumps are powered by pressurized air and the aggressive liquid flow rate is controlled by controlling the flow of the air.
  • one membrane draws the aggressive liquid into its respective chamber, while the other one forces aggressive liquid out and vice versa.
  • Such pumps for pumping aggressive liquids are produced for example by ASTI Company of France (models PCS-O, PCS-1 and PCS-2).
  • Each chamber is provided with a separate liquid distributing means. Connecting the two separate distributing means by pipes is therefore required, in order to obtain a single intake and exhaust, which makes the design complex and enlarges the number of parts necessary, in particular the number of sealings. The complexity of the design makes assembling and disassembling more difficult, which has an adversive effect on the complete sealing.
  • Bellows are mounted on the side of the body at a position between a suction and an exhaust valve.
  • the valve members are operated by a pressure force of the liquid originating from the movement of pressured air driven bellows.
  • the pressure force of the liquid acts opposite to a retaining force of the valve members that is generated by bar magnets completey embedded in the PTFE of the valve members. Because of the magnets, springs, that could be corroded by the aggressive liquid are avoided.
  • Each chamber has a compact design, however, the necessary size is increased by using two pumps alternatively operated to obtain a more continuous flow of liquid.
  • the problem of the invention is to provide a new design for an aggressive liquids pump that allows to build pumps smaller than known from the state of the art with good flow control and sealing capabilities.
  • an aggressive liquid pump for transferring and dosing with a housing made of Koterm (R) and comprising two opposite cylinders, each divided by a movable membrane into two chambers, one for the liquid and the other for a driving gas, and both membranes being fastened to each other by a rod movable in a central boring within the housing, comprising two further cylindrical borings, each one parallel to the connecting rod, with openings at both ends into the chambers of the cylinders provided for the liquid, and each containing two valve elements, i.e., two exhaust valve elements in one boring and two suction valve elements in the other boring, the valve elements being also made completely of non-corrosive material and having completely embedded bar magnets, each situated in the end of each valve element, which is facing the other valve element in the same boring, the bar magnets in the suction valve elements facing each other with different poles and the bar magnets in the exhaust valve elements facing each other with matching poles.
  • R Koterm
  • the pump according to the invention is of the two chamber type as described already above. It has a compact design, is easy to produce and to disassemble because of the special construction of the housing and the valve elements being placed in borings of the housing. In the valve elements bar magnets are embedded, generating a retaining force, directed opposite to the force due to the pressure difference generated by the motion of the members introduced by a pneumatic drive. If the pressure of the pneumatic drive completely drops, the magnetic force is able to seal the valves properly, thus allowing proper pumping even under low pressure. Fine regulation of the aggressive liquid pumping speed is therefore also possible.
  • Fig. 1 shows the general design of an embodyment of a pump according to the invention.
  • the pump 1 is fixed on a housing 2 of the pneumatic elements.
  • the pressured air to drive the pump is supplied via a connector 3, situated in the housing.
  • a connector 3 situated in the housing.
  • a muffler 5 can be regulated from the front panel of the housing 2 for the pneumatic elements.
  • the muffler serves to regulate the air flow, thus regulating the flow of the pumped aggressive liquid. Detailed description of its function will be given below in reference to Fig. 3.
  • the pump 1 is fixed on the housing for the pneumatic elements by a screw 6 made of brass.
  • the pump 1 consists mainly out of liquid distributions means 7 in the center and two cylinders 8 at each side of the distribution means 7.
  • the cylinders are made of Koterm.
  • switchhousings 9 are fixed containing microswitches that will be described later.
  • the switchhousings 9, the cylinders 8, and the distribution means 7 are fastened together by flanges 10 made out of duraluminium, bolts 11 made of steel, nuts 12 and washers 13. Additionally air pumping means 14 are visible in Fig. 1, delivering pressured air from the housing 2 to the pump 1.
  • the function and the interior construction of the pump can be seen more easily from a sectional drawing along the lines I-I of Fig. 2.
  • This figure shows in particular the inside structure of the liquid distribution means 7 sandwiched by the both cylinders 8 and the switchhousings 9.
  • the liquid distribution means 7 comprises a housing 15 made of Koterm (R), which is shown in Fig. 4 in detail.
  • the housing 15 is cylindrical and has a center boring 16 and two borings offset from the center, used as exhaust chamber 17 and inlet chamber 18 for pumping the aggressive liquid.
  • the exhaust chamber 17 contains two exhaust valve elements 19, and the inlet chamber 18 two suction valve elements 20. Both chambers contain corresponding valve seats 21 and 22 for the respective valve elements 19 and 20 as well. All these parts are made of Koterm (R).
  • the pressure in the chambers 17 and 18 to move the valve elements 21, 22 is generated by membranes 23 made of teflon (R), moved by pressured air in the cylinders 8. Both membranes 23 are connected via a connecting rod 24 made of stainless steel.
  • the connecting rod ist fixed at the membranes 23 with screws 25, also made of stainless steel.
  • the inlet chamber 19 is closed on both sides with special screws 27 made of teflon, having a central boring allowing the pressure generated by the movement of the membranes 23 to act on the suction valve elements 20.
  • the center boring 16, bearing the connecting rod 24 is closed with special screws 28 made of teflon (R).
  • Each of the suction valve elements 20 and the exhaust valve elements 19 incorporate magnets 29 and 30 respectively.
  • the magnets 29 generate a force between the both suction valve elements 20 that seals the intake when the air pressure is very low.
  • the magnets 30 generate a repulsive force between the exhaust valve elements 19 to open the exhaust when the air pressure drops. This way the magnets allow even a proper function of the pump under low pressure.
  • FIG. 3 A pneumatic scheme to drive the pump is shown in Fig. 3.
  • Air under pressure of 2.5 to 5.0 bars enters at the 3/2 distributor 4, flows through the muffler 5 to a 5/2 distributor 31 and further to one of the membranes 23 and wides it. Because of the connection of the both membranes 23 with the connection rod 24 the movement of one membrane 23 is transferred to the other.
  • the pumping scheme assume that the right membrane 23 moves to the left. Then the air from the inside part of the left membrane 23 freely leaves into the atmosphere through the 5/2 distributor 31, the same time the left membrane generates the underpressure in the left chamber, sucking the aggressive liquid in the way it was described before.
  • the speed of the membrane movement is regulated which also regulates the flow of the aggressive liquid.
  • the flow of aggressive liquid changes linearly dependent on the number of cycles of the membrane per minute.
  • Fig. 4 shows the housing 15 of the distribution means 7 made of Koterm. It is of cylindrical shape 86 mm long with a diameter of 70 mm.
  • the center boring 16 is 10.5 mm in diameter, giving enough tolerance for the movement of the rod, that is cylindrical with 10 mm diameter.
  • the borings used for the exhaust chamber 17 and the inlet chamber 18 are each 14.5 mm wide.
  • Fig. 4 shows in addition a radial extending hole 32 with an M10 thread for fixing the screw 6.
  • Fig. 5 and 6 show how the suction valve elements 20 are shaped and in particular how the magnets 29 are embedded in the material.
  • the suction valve element 20 is made of Koterm with a maximum outer diameter of 14.5 mm . In the center a hole 33 with a diameter of 4.5 mm is provided to fix a cylindrical magnet 29 of 4.5 mm diameter.
  • a plug 34 As shown in Fig. 6. It has two cylindrical sections 35 and 36 with a conical section 37 between them.
  • the cylindrical section 35 is 4.4 mm in diameter so that the plug 34 fits well in the hole 33 of the inlet valve element 20.
  • the conical section 37 seals the hole 33 after introduction of the magnet Because the plug 34 and the suction valve element 20 is made of Koterm the whole valve element resists against aggressive liquids. The magnets are completely embedded inside the valve element 20 and secured.
  • Fig. 7 shows the shape of the exhaust valve elements 19. It comprises also a central hole 38 to include the magnet 30 that is fixed with a plug similar to that in Fig. 6.
  • Fig. 8 shows the details of the microswitch 26 used to reverse together with the 5/2 distributor 31 the flow of pressured air from one membrane 23 to the other.
  • the membranes 23 act on an actuator 39 of the microswitch 26 made of brass.
  • the actuator 39 is held in position relative to the housing 40 made of brass by a spring 41 made of spring iron wire.
  • the spring 41 is acting on a ball housing including a ball 43 that is secured with another spring 41.
  • openings 44 and 45 as inlet and outlet for pressured air.
  • the inside part of the membrane 23 moves the actuator 39 and closes the opening 45 before the other end of the actuator 39 moves the ball 43 and makes it possible for air under pressure to pass by the ball 43 through the opening 44.
  • Air under pressure works on the part marked by the arrow with the reference number 46.
  • the described embodiment of the invention showed excellent properties in transporting aggressive liquids, fine-regulating aggressive liquids and it has a simple construction allowing easy disassembling and assembling of the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Claims (2)

  1. Pompe pour transferer et doser des liquides agressifs comportant un carter (15) réalisé en Koterm (R) et comprenant deux cylindres opposés (8) divisés chacun par une membrane mobile (23) en deux chambres, l'une pour le liquide et l'autre pour un gaz d'entraînement, les deux membranes (23) étant fixées l'une à l'autre par une tige (24) mobile dans un perçage central (16) à l'intérieur d'un carter (15), comprenant deux autres perçages cylindriques (17-18), chacun parallèle à la tige de liaison, débouchant à leurs deux extrémités dans les chambres des cylindres prévues pour le liquide, et contenant chacun deux éléments de soupape, à savoir deux éléments de soupape d'échappement (19) dans le perçage (17) et deux éléments de soupape d'aspiration (20) dans l'autre perçage (18), les éléments de soupape étant également réalisés en Koterm (R) et contenant, complètement noyés à l'intérieur, des barreaux magnétiques (29-30) dont chacun est situé à l'extrémité de chaque élément de soupape (19,20) qui fait face à l'autre élément de soupape (19,20) dans le même perçage, les barreaux magnétiques (29) dans les éléments de soupape d'aspiration (20) se faisant face avec des pôles différents et les barreaux magnétiques (30) dans les éléments de soupape de refoulement (19) se faisant face avec des pôles correspondants.
  2. Pompe selon la revendication 1,
    caractérisée en ce que des micro-interrupteurs (26) sont disposés à l'intérieur des chambres des cylindres prévus pour le gaz d'entraînement chaque micro-interrupteur (26) étant actionné par chacune des membranes (23 ) se trouvant dans les cylindres.
EP19900113590 1989-07-14 1990-07-16 Pompe de dosage à membrane pour liquides agressifs Expired - Lifetime EP0408083B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
YU1423/89 1989-07-14
YU142389 1989-07-14

Publications (2)

Publication Number Publication Date
EP0408083A1 EP0408083A1 (fr) 1991-01-16
EP0408083B1 true EP0408083B1 (fr) 1995-06-07

Family

ID=25554115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900113590 Expired - Lifetime EP0408083B1 (fr) 1989-07-14 1990-07-16 Pompe de dosage à membrane pour liquides agressifs

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Country Link
EP (1) EP0408083B1 (fr)
DE (1) DE69019883T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5308230A (en) * 1993-03-08 1994-05-03 Stainless Steel Products, Inc. Bellows pump
US5927954A (en) 1996-05-17 1999-07-27 Wilden Pump & Engineering Co. Amplified pressure air driven diaphragm pump and pressure relief value therefor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1920014A (en) * 1931-06-26 1933-07-25 Trico Products Corp Multiple diaphragm pump
US3282167A (en) * 1964-04-09 1966-11-01 Walker Mfg Co Reciprocating fluid motor
ES429933A1 (es) * 1974-09-10 1976-12-01 Rambert Sa Sobrepresor perfeccionado de fluidos.
GB8312122D0 (en) * 1983-05-04 1983-06-08 Production Tech Ltd Pumping corrosive fluids
IT1223054B (it) * 1987-11-04 1990-09-12 O D L Srl Pompa per il trasferimento di liquidi in particolare di birra o di bevande gasate

Also Published As

Publication number Publication date
DE69019883T2 (de) 1996-03-14
EP0408083A1 (fr) 1991-01-16
DE69019883D1 (de) 1995-07-13

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